Kenwood Dpc-77 User manual

Deas

KENWOOD

S)

AYA)

aA

LOAN

1988-5

PRINTED

IN

JAPAN

BS51-3483-00(T)667

Top

cover

ass‘y

(A52-0125-08)

Frame

assy

{(A13-1136-08)

Knob

(button)

OPEN

(K27-1936-08)

Knob

(button)

POWER

(K29-3388-08)

Phone

jack

(E11-0186-08)

Knob

(button)

VOLUME

Knob

(button)

STOP

(K29-3387-08)

{K27-1933-08)

Knob

(button)

R.

SKIP

Knob

(button)

F.

SKIP

Battery

ass’y

(K27-1935-08)

(K27-1934-08)

(W09-0098-08)

Knob

(button)

PLAY/PAUSE

(K27-1923-08)

SPECIFICATIONS

PICK

UP

VPA

cc

cetns.

cae

coe

ace

pnepabemsenenenenienuccs

Optical

pick

up

LASOPEY

DO!

casicccsascctesesuvecavawovendorass

Semiconductor

laser

AUDIO

Channels)

\sic.ccccexesestvvovtscnenvses

...

2

channels

Frequency

response

.».

20

Hz

-

20,000

Hz,

+1

dB

Dynamic

Range

........

--.

90

dB

(at

1

kHz)

Total

harmonic

distortion

..............

0.01%

(at

1

kHz)

Channel

separation

..................0005

75

dB

(at

1

kHz)

Wow

&

flutter

........

...

Below

measurable

limit

PHONES

jack

(3.5

mm

stereo

mini

jack)

LINE

OUT

jack

(3.5

mm

stereo

mini

jack)

DIGITAL

OUT.

jack

(3.5

mm

mono

mini

jack)

DC

IN

(external

power

supply

jack

5.5

mm)

20

mW

+

20

mW

(16-ohm,

at

1

kHz)

Output

terminals

Input

terminals

Output

level

...

Cine:

oUt

putes.

cc

ccsccscsessorciessscersescees

1

V

(10

k-ohm

at

1

kHz)

GENERAL

Power

requirements

...............0..00.

6

V

DC

built-in

rechargeable

lead

acid

battery,

120

V

AC

60

Hz

(U.S.A.

and

Canada

type,

us-

ing

the

provided

AC

adaptor)

or

110-120/220-240

V

AC,

50/60

Hz

(All

other

type,

using

the

provided

AC

adaptor)

Power

consumption

...................05

1.8

W

Battery

life

..........

--

About

5.5

hours

(continuous

repeat

playback)

Charging

time

......

-.

Approximately

8

hours

Dimensions

..........

--

128

X

34.9

145

mm

(main

body)

Weight

........

a«

Z50%g

WRCCOSSONES:

secssiscasDectactiiaieaszesseseae

Connection

cord

x

AC

adaptor

x1

Carrying

belt

x1

Car

audio

cassette

adaptor

(CAC-1)

x1

KENWOOD

follows

a

policy

of

continuous

advancements

in

development.

For

this

reason

specification

may

be

changed

without

notice.

*

Refer

to

parts

list

on

page

79.

DPC-77

CONTENTS

SPECIRICATIONS

3c5Po5

cue

hal

cee

oditihies

eet

hens

atebel

gate

1

U403:

CMOS

4-bit,

1-chip

microprocessor

PRECAUTION

FOR

HANDLING

LASER

PICKUP..............

2

(CXPDO

ZA)

ies

rodtpadngpadecsueattedcte

a

skal

1

51

DISASSEMBLY

FOR

REPAIR

...........0.00..0.c0ccccccveenese

eee

2

U402:

Static

RAM

(LC3517ALM-15)......0000.cee

54

BLOCK:

DIAGRAMS.

ohis

ocieblices

cade,

doe

becuase

Deel

tudor

oes

5

U404:

Digital

filter

for

CD

players

(SM5807ES)..........

55

OPERATION?

janes

aioe

Gites

a

eache

tes

niedeg

tate

whiny

it

be

G0

7

U501:

16-bit

D/A

converter

(PCM6OP-KY)

..........0..0..

59

CAC-1

DESCRIPTION

00.00.00...

ccc

cece

ce

cece

ece

eee

eceeeaes

14

ADJUSTMENT/REGLAGES/ABGLEICH....00.0.00.0.0

cece

61

CIRCUIT

DESCRIPTION

TROUBLESHOOTING

20.00...

cccc

cee

ec

ccc

eee

eseeeenes

64

Description

of

components............0.0.0...ccccccceeeceeeeees

15

PC

BOARD

2)

oxccenctind

«Salve

canahldtsaat

disteev

ene

hioreech

te

tedon

67

U101:

RF

amplifier

for

the

CD

(CXA1081M)..............

16

SCHEMATIC

DIAGRAM..........0..0.00cccccecccccese

cca

eceeceeee

nes

73

U301:

Servo

signal

processor

for

the

CD

(CXA1082AQ).22

EXPLODED

VIEW

(MECHANISM)..........0....0.:cccccseeeeeeeee

77

U351,

U352:

PWM

drivers

for

the

CD

(BA6280AF)

....27

EXPLODED

VIEW

(UNIT)...

0...

e

ec

cecc

ese

eee

eens

78

U401:

Digital

signal

processing

LSI

for

the

CD

PARTS

EIS

Mecca

Qoncecretis

Bete

G

are

eet

That

lace

anes

e

eek,

79

(GADIAZ5O)

ent

edits

on

fi

weat

noes

Sides

a

tanhtnles

28

PACKING

sic

ca

dodanie

te)

co

ea

ine

nore

te

stnaditae

Vela

aisles

ne

me

ao)

87

PRECAUTION

FOR

HANDLING

LASER

PICKUP

DISASSEMBLY

FOR

REPAIR

1.

Remove

the

4

screws

(@)

fixing

the

cover

(bottom

case)

to

the

chassis,

and

then

take

off

the

cover

(bottom

case).

2.

At

this

time,

disconnect

the

connector

linking

the

bat-

tery

on

the

cover

(bottom

cover)

to

the

PC

board

(@).

3.

Remove

the

2

screws

(@)

fixing

the

holder

to

the

cover

{bottom

case),

and

remove

the

holder.

DISASSEMBLY

FOR

REPAIR

4.

Remove

the

screw

(@)

fixing

the

PC

board

to

the

chassis.

5.

Disconnect

the

connector

linking

the

PC

boards

(@).

6.

Take

out

the

PC

board

in

the

direction

of

the

arrow

(@).

7.

Remove

the

2

screws

(@)

fixing

the

PC

board

to

the

chassis.

8.

Remove

the

flexible

PC

boards

attached

to

connec-

ors

J101

and

J102

(@,

©).

9.

Using

a

flat-blade

screwdriver,

disconnect

the

connector

attached

to

connector

J105

(@).

10.

Using

a

soldering

iron,

remove

the

cord

attached

to

the

PC

board

and

motor

on

the

Mechanism

Ass'y

(@).

11.

Remove

the

screw

(@)

fixing

the

cord

from

the

PC

board

to

the

chassis.

12.

Remove

the

3

screws

(@)

fixing

the

Mechanism

Ass’y

to

the

chassis,

and

then

take

out

the

Mechanism

Ass'’y.

13.

Remove

the

screw

(@)

fixing

the

spring

for

the

OPEN

but-

ton

to

the

chassis,

and

then

take

out

the

spring.

Removing

the

battery

Remove

the

7

screws

(@)

fixing

the

cover

(bottom

case)

and

battery,

and

then

take

out

the

battery.

DPC-77

DISASSEMBLY

FOR

REPAIR

Disassembly

of

Mechanism

1.

Loosen

the

2

screws

(@)

holding

down

the

PU

shaft,

and

then

pull

out

the

PU

shaft

(@).

2.

Take

out

the

PU

shaft

in

the

direction

of

the

arrow

(@),

separating

it

from

feed

screw

@.

3.

Remove

the

E

ring

(Q)

holding

gear

@,

and

then

take

out

gear

@.

4.

Remove

the

screw

(@)

on

the

metal

hardware

holding

feed

screw

@,

and

then

take

out

the

metal

hardware.

5.

Disengage

the

claw

of

the

locking

hardware

holding

feed

screw

@

to

the

Mechanism

Ass’‘y,

and

then

pull

out

feed

screw

@

in

the

direction

of

the

arrow

(@).

6.

Remove

the

2

screws

(@)

fixing

the

motor,

and

then

take

out

the

motor.

{The

motor

is

attached

to

the

Mechanism

Ass’y

and

by

double-side

adhesive

tape.)

7.

Remove

the

screw

(@)

fixing

the

leaf

switch

to

the

Mechan-

ism

Ass‘y,

and

then

take

out

the

leaf

switch.

1.

Feed

motor

current

check

Apply

a

1.5

V

DC

supply

to

the

feed

motor,

and

the

check

the

current

value.

The

current

should

be

about

70

mA

through

the

pickup

move-

ment

from

the

innermost

to

the

outermost

position.

2.

Lead-in

time

check

Measure

the

lead-in

time

using

a

test

disc

from

SONY

(YEDS-18,

Type

4),

and

adjust

it

to

between

4

min.

30

sec.

and

5

min.

The

lead-in

time

can

be

changed

by

adjusting

the

leaf

switch

position.

3.

Leaf

switch

replacement

Similar

to

the

head

replacement

procedure,

remove

the

feed

screw

and

head

before

replacing

the

leaf

switch.

During

this

operation,

take

care

so

as

not

to

damage

the

screws.

Check

the

lead-in

time

after

replacement.

4.

Joint

arm

replacement

In

addition

to

the

head

replacement

operations,

remove

the

joint

arm

from

the

laser

pickup

and

proceed

with

the

job.

Take

care

so

that

bonding,

etc.,

does

not

get

on

the

laser

pickup.

5.

Disc

table

replacement

(motor

or

mechanism

chassis)

The

disc

table

is

attached

to

the

disc

motor

shaft

by

adhesion,

so

these

parts

should

be

replaced

as

a

set.

These

parts

are

also

supplied

in

the

form

of

an

assembly.

For

replacement,

change

all

of

the

parts

as

a

whole.

DPC-77

BLOCK

DIAGRAM

U101:CXA1081M

USO

1:

PCM6OP-KY

U701:

74HCO4

RF

AMP

D/A

CONVERTER

INV!

ERTER

Ly

cg

[e-BIT

LATCH

Dar]

Seo

a

DIGITAL

OUT

[é=BIT

LATCH

HA]

AUDIO

AMP

LPF

US02:

NIM3415M

RFI}

EYE

PATTERN

TEST

POINT

U402:

LC3517ALM

RAO}

~RAIt

RAM

ADORESS

RAM

aa

Hes

38-48

29-37

2Kx8

U503

=NJM34

15M

HEAD

io

PHONE

172

VCC

HIGH

MUTE

FILTER

Sw

OSO03L/R

Q594L/R

LEFM-PLC

}

frecara

6h,

|

SELECTOR

papccDATA

C

foowacg

2

|

ye

vec

U503

U90

1:

BAS7OOAF

REGULATOR

Be:

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LINE

U404:

SM5807ES

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DIGITAL

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53

af

ial

is]

J

Lb

ERROR

Pe

i

|

SRFEe

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al

172

VCC

U802

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MUTG

7

Sw

Ww

14

ra

ee

Ea

INTERFACE

ZEM

a

PROCESSOR

Jefe

BATTERY

KINO-KING

KS1~KS3

SEGO~SEG19

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U351:

BAG280AF

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14

CIRCUIT

DESCRIPTION

OF

COMPONENTS

Component

Use/Function

Operation/Condition/Compatibility

ul

Switching

regulator

DC/DC

converter

switch.

U101

RF

amplifier

See

the

IC

description.

(p.13)

-U301

Servo

amplifier

See

the

IC

description.

(p.19}

|

U302

Operation

amplifier

Amplifies

the

feed

motor

drive

signal.

U351

Actuator

control

See

the

IC

description.

(p.24)

U352

Motor

control

See

the

IC

description.

(p.24)

U401

Digital

signal

processor

See

the

IC

description.

(p.25)

402

Static

RAM

See

the

IC

description.

{(p.51)

U403

MMigtoptneasenr

See

the

IC

description.

(p.48)

U404

Digital

filter

See

the

IC

description.

(p.47)

U501

D/A

converter

See

the

IC

description.

(p.52)

U502

Audio

amplifier

Buffer

amplifier

for

DAC

output.

LPF

Lew:

pass

filter.

6-INVERT

Digital

out

signal

buffer

Oberational

Amnniier:

1/2

Vcc

generator

for

the

audio

Circuit.

Switching

regulator

Controls

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charging

circuit.

DC/DC

converter

output

Switch

Turns

the

DC

converter

Sitar

ON/OFF.

DCIDC

converter

output

switch

control

Turns

Q1

ON/OFF.

Reset

swine

Turns

the

reset

circuit

ON/OFF.

Lo

swiiteh

Low

battery

indicator

switch

‘Goes

ON

wel

the

battery

voltage

is

5.

5

v

or

less.

i;

Focusing

signal

switch

Switches

the

pickup’s

laser

diode

ON/OFF.

Holds

the

focusing

offset

Position

during

playback

of

a

scratched

disc

(DEFECT-

a

Tracking

[i

Turns

the

ATSC

ci

circuit

ON

during

KEY

LOCK.

Focusing

gain

switch

Increases

the

focusing

gain

during

KEY

LOCK.

Power

awiek

Switches

the

power

to

the

whole

system,

except

for

the

CPU.

Actuator/motor

driver

power

switch

-

Emphasis

Supplies

power

to

the

actuator

and

motor

drive

IC.

Applies

emphasis

when

an

emphasis

signal

is

detected

by

the

CPU.

High

filter

When

the

key

is

pressed,

the

CPU

outputs

an

ON/OFF

signal

to

switch

the

filter

circuit

ON/OFF.

“Muting

Mutes

the

audio

signal.

Q505

Muting

driver

Controls

Q506.

When

the

microprocessor

outputs

the

muting

signal,

Q505

receives

it

and

turns

the

signal

level

ON/OFF.

Q506

Muting

driver

Turns

the

muting

driver

ON/OFF.

if

the

supply

voltage

drops

(to

3.5

V),

Q507

goes

OFF

to

turn

the

muting

drivers

ON.

Q805,

806,

808

Ripple

filter

Ripple

filter

for

the

audio

circu

power

supply.

Q807

Ripple

filter

switch

Switches

the

audio

circuit

power

.

ON/OFF

according

to

an

n

ONIOFF

signal

from

the

CPU.

Q901

Charger

circuit

switch

Turns

the

charger

circuit

ON/OFF.

Q903

:

Power

switch

Turns

the

charging

output

voltage

ON/OFF.

DPC-77

CIRCUIT

DESCRIPTION

U101:

RF

AMPLIFIER

FOR

THE

CD

Structure

(CXA1081M)

Bipolar

silicon

monolithic

IC

Note:

The

following

only

describes

the

required

features,

as

extracted

from

the

Handbook.

Functions

©

RF

amplifier

General

¢

Focus

OK

detector

circuit

The

CXA1081M

is

an

IC

developed

for

use

in

Compact

Disc

e

Mirror

detector

circuit

e

Tracking

error

amplifier

e

Defect

detector

circuit

e

APC

circuit

¢

EFM

comparator

e

Auto

asymmetry

control

amplifier

players.

It

incorporates

a

3-spot

optical

pickup

RF

output

amplifier,

a

focusing

error

amplifier,

a

tracking

error

amplifier,

and

other

signal

processing

circuitry,

such

as

focus

OK,

mir-

ror,

defect,

and

EFM

comparator

circuits,

as

well

as

a

laser

diode

APC

(Automatic

Power

Control)

circuit.

Features

¢

Operates

on

a

signal

+5

V

power

supply,

as

well

as

on

a

+5

V

dual-voltage

power

supply.

¢

Low

power

consumption

(100

mW

with

+5

V,

50

mW

with

+5

V).

@

An

APC

circuit

which

accepts

either

a

P-sub

or

N-sub

laser

diode.

©

A

minimum

of

external

parts

required.

e

A

disc

defect

detector

circuit

for

improved

playability.

Block

diagram

MIRR

(25)

DGND

g

(2)

-

©

:

i

ae

tC

og

=u

a

eo

we

=

Zu

sz

=5

az

<

3

a”

&o

o

0

°

290

Lx

Bo

=

.-¢

EFM

COMPARATOR

OIFFEREN—

TIAL

AMP

t

O

R

MI

K

i

MIRROR

Voltage

Reference

TRACKING

ERROR

AMP

V5

A

PEA

HOL

©)

DEFECT

BOTTOM

HOLD

Current

Reference

CENTER

VOLTAGE

BUFFER

RF

I-V

AMP

(1)

E

1-V

AMP

OQ

RF

I-V

AMP

(2)

OF

I-V

AMP

S

So)

©)

a

°

ee

CIRCUIT

DESCRIPTION

Terminal

explanation

(Vcc

=

2.5

V,

Vee

=

Dono

=

—2.5

V,

VC=GND)

Terminal|

Terminal

DC

voltage

No.

name

(V)

Function

RFI

0

Input

for

the

C-coupled

signal

output

from

the

RF

summing

amplifier.

+

RF

summing

amplifier

output

pin.

Used

as

the

check

point

for

the

eye

pattern.

RF

summing

amplifier

feedback

input

pin.

P-sub/N-sub

select

for

the

LD

(Laser

Diode).

(DC

voltage:

in

N-sub

mode)

“APC

LD

amplifier

output

pin.

(DC

voltage:

PD

open

in

N-sub

mode)

"APC

LD

amplifier

input

pin.

(DC

voltage:

open)

RF

I-V

amplifier

(1)

inverted

input

pin.

Current

input

by

connecting

to

the

photodiode

A+C

terminal.

RF

I-V

amplifier

(2)

inverted

input

pin.

Current

input

by

connecting

to

the

photodiode

B+D

terminal.

Connected

to

GND

when

using

a

positive

{+

)/negative

(—)

dual-voltage

power

supply.

Connected

to

VR

{pin

14)

when

using

a

single-voltage

power

supply.

16

CC1

eo)

1.2

——__——}—

$f

$f.

F

I-V

amplifier

inverted

input

pin.

Current

input

by

connecting

to

the

photodiode

F

terminal

E

|-V

amplifier

inverted

input

pin.

Current

input

by

connecting

to

the

photodiode

E

terminal.

E

|-V

amplifier

output

pin.

E

|-V

amplifier

feedback

input

pin.

For

E

I-V

amplifier

gain

adjustment.

DC

voltage

output

of

(Vcc

+

Vee}/2

Input

for

the

C-coupled

signal

output

from

the

defect

bottom

hoid.

Defect

bottom

hold

output

Connected

to

the

negaiive

power

supply

when

using

a

positive

(+)/negative

(—)

dual-voltage

power

supply.

Connected

to

GND

when

using

a

single-voltage

power

supply.

FE

BIAS

Bias

on

the

focus

error

amplifier

non-inverted

side.

For

CMR

adjustment

of

the

focus

error

amplifier.

FE

Focus

error

amplifier

output

pin.

+

20

TE

Vreo

Tracking

error

amplifier

output

pin.

DEFECT

Defect

comparator

output

pin.

(DC

voltage:

connected

to

a

10

k-ohm

load).

4.

MIRR

Mirror

comparator

output

pin.

(DC

voltage:

connected

to

a

10

k-ohm

load).

CP

Mirror

hoid

capacitor

output

pin.

Mirror

comparator

non-inverted

input.

CB

Defect

bottom

hold

capacitor

connect

pin.

Connected

to

GND

when

using

a

positive

(+

)/negative

(—)

dual-voltage

power

supply

Connected

to

GND

(Vee)

when

using

a

single-voltage

power

supply.

Auto

asymmetry

control

input

pin.

+

EFM

comparator

output

pin.

(DC

voltage:

connected

to

a

10

k-ohm

joad}

FOK

comparator

output

pin.

(DC

voltage:

connected

to

a

10

k-ohm

load).

LD

ON/OFF

select

pin.

(DC

voltage:

when

LD

ON)

*APC:

Automatic

Power

Control

+

Positive

power

supply.

—

17

DPC-77

CIRCUIT

DESCRIPTION

FUNCTION

EXPLANATION

RF

amplifier

The

photodiode

current

input

to

the

input

pins

(PD1,

PD2)

is

converted

to

a

voltage

by

an

equivalent

resistance

of

The

voltage

which

is

converted

from

the

current

of

the

photodiode

(A+B+C+D)

is

added

in

the

RF

summing

amplifier

and

is

output

from

the

RFO

pin.

The

eye

pattern

can

58

k-ohms

in

RF

|-V

amplifier

(1)

and

(2)

respectively.

be

checked

at

this

pin.

Vee

RF

SUMMING

AMP

RF

I-V

AMPLIFIER

The

low

frequency

component

of

the

RFO

output

voltage,

Varo,

is

represented

by

the

following

equation:

Vreo=

2.2

x

(VA+

Va)

=

127.6

k-ohms

x

(ipo1

+

ipp2)

Focus

error

amplifier

The

difference

between

the

RF

I-V

amplifier

(1)

output

(VA)

and

the

RF

|-V

amplifier

(2)

output

(VB)

is

calculated,

and

the

current

of

the

photodiode

(A+C—B-—D)

is

converted

to

a

voltage

and

output.

—(B+D)

—(A+C)

The

common

mode

rejection

ratio

of

the

VR

connected

to

(8)

is

maximized

when

the

composite

impedance

to

GND

is

around

10k-ohms

(with

a

VR_

resistance

of

around

40

k-ohms).

The

FE

output

voltage

(low

frequency)

is

represented

by

the

following

equation:

Vre=5.4

x

(Va—

Va)

=

(ipp2—1P01)

X

315.4

k-ohms

18

CIRCUIT

DESCRIPTION

Tracking

error

amplifier

The

current

from

the

side

spot

photodiodes

is

input

to

pins

E

and

F

and

is

converted

to

a

voltage

by

the

E

I-V

amplifier

and

F

|-V

amplifier

respectively.

That

is:

Vr

=iF

Xx

403

k-ohms

Ve=IEx

260

k-ohms

x

Ra/(Ra+

22

k)+(Ra+

260

k)

Focus

OK

circuit

The

focus

OK

circuit

creates

a

timing

window,

turning

the

focusing

servo

ON

with

the

focus

search

status.

While

an

RF

signal

is

present

at

@)an

HPF

output

is

pre-

sent

at

pin).

At

the

same

time,

the

LPF

output

(opposite

phase)

of

the

focus

OK

amplifier

is

obtained.

The

focus

OK

output

is

inverted

when

Vari—

Varo

is

almost

equal

to

—0.37

V.

26K

TRACKING

ERROR

AMP

The

difference

between

the

E

I-V

amplifier

and

the

F

I-V

amplifier

is

calculated

by

the

tracking

error

amplifier,

and

the

photodiode

(E-F)

current

is

converted

to

a

voltage

and

output.

Vtte=(Ve—VeF)

x

3.2

=(iE-iF)

x

1290

k-ohms

Focus

OK

COMPARATOR

C34

is

used

to

determine

the

time

constants

of

the

EFM

com-

parator,

the

HPF

in

the

mirror

circuit,

and

the

LPF

in

the

focus

OK

amplifier.

Normally,

C34=0.01

pF

is

selected,

with

fc=1

kHz.

This

will

prevent

degradation

of

the

block

error

rate

due

to

an

RF

envelope

lack

caused

by

cracks,

etc.

on

the

disc.

19

DPC-77

CIRCUIT

DESCRIPTION

Mirror

circuit

While

the

peak

hold

is

held

by

a

time

constant

which

can

In

the

mirror

circuit,

after

the

RFI

signal

is

amplified,

both

its

follow

a

traverse

of

30

kHz,

the

bottom

hold

is

held

by

a

time

peak

and

bottom

are

held.

constant

which

can

follow

a

cyclic

period

envelope

variation.

aan

|

il

qn

aes

wr

=a

il

Ov

G

Addn

Pil

ll

(RFI)

a

H

Feet

DISS

eM

j

(BOTTOM

OV

HOLD)

(MIRROR

HOLD)

MIRR

MIRROR

HOLD

AMP

aceeeuEn

hace

MIRROR

|

COMPARATOR

OGNO

I

a

ee

se

ee

en

ee

ed

These

peak

and

bottom

hold

signals,

H

and

|

are

differentially

mirror

output

goes

’’L’’

on

the

disc

tracks

and

goes

‘'H”’

bet-

amplified

to

obtain

the

DC-reproduced

envelope

signal

J.

This

ween

tracks

(mirror

section).

In

addition,

the

output

goes

signal

is

compared

with

signal

K,

which

is

obtained

by

a

peak

‘“H’"

when

a

defect

is

detected.

The

time

constant

of

the

mir-

hold

with

a

large

time

constant

corresponding

to

2/3

of

the

ror

hold

should

be

quite

large

when

compared

with

the

peak

value,

so

that

the

mirror

output

is

obtained.

That

is,

the

traverse

signal.

20

DPC-77

CIRCUIT

DESCRIPTION

EFM

comparator

The

EFM

comparator

converts

the

RF

signal

into

a

binary

cod-

ed

signal.

Since

asymmetry

caused

by

dispersion

when

manufacturing

the

discs

cannot

be

reduced

by

AC

coupling

AUTO

ASYMMETRY

CONTROL

AMP

RFI

The

EFM

comparator

is

designed

as

a

current

switching

type,

and

the

‘‘H'’’

and

‘'L”’

levels

are

not

equal

to

the

power

voltages.

Therefore,

feedback

is

required

via

a

CMOS

buffer.

R8,

R9,

C8

and

CY

constitute

an

LPF

to

obtain

the

DC

com-

Defect

circuit

After

inverting

the

RFI

signal,

the

defect

circuit

bottom

holds

with

two

long/short

time

constants.

The

bottom

hold

with

a

shorter

time

constant

responds

to

a

mirror

defect

of

more

than

0.1

msec

on

the

disc,

and

the

bottom

hold

with

a

longer

time

constant

holds

the

mirror

level

obtained

immediately

before

the

defective

section.

These

signals

are

C-coupled,

then

differentiated

with

level

shifting.

The

signals

are

com-

pared

with

each

other

to

generate

the

mirror

defect

detecting

signals.

only,

the

reference

voltage

of

the

EFM

comparator

is

controll-

ed

using

the

characteristic

that

the

present

probability

of

a

1

or

O

is

50%

each

for

the

binary

coded

EFM

signal.

wee

enn

nn

ee

-

[>

r

5

I |

'

ponent

of

(Vcc

+

DGND)/2

(V).

If

the

cut-off

frequency

(fc)

is

set

to

more

than

500

Hz,

leakage

of

the

EFM

low

frequency

signals

will

be

greatly

increased

and

will

result

in

a

degrada-

tion

of

the

block

error

rate.

©

TMONAONG

{NI

»

LON

HLM

he

d

-

arr

_Y—

HOLD

(2)

BOTTOM

HOLD

(1)

;

Broken

line

Continuous

line

CC2

Vie:

Aas

dl,

hace

e

L

1.4

msec

MAX.

DEFECT

COMPARATOR

DEFECT

AMP

DEFECT

BOTTOM

HOLD

21

|

DPC-77

22

CIRCUIT

DESCRIPTION

U301:

SERVO

SIGNAL

PROCESSOR

FOR

THE

CD

(CXA1082Q)

General

The

CXA10820

is

a

bipolar

IC

developed

for

servo

control

in

Compact

Disc

players.

Features

Operates

on

a

signal

+5

V

power

supply

as

well

as

on

a

+5

V

dual-voltage

power

supply.

Low

power

consumption

(165

mW

with

+5

V,

100

mw

with

+5

V).

Same

servo

function

as

CX20108

(focusing,

tracking,

sled

servo)

Built-in

auto

sequencer.

Built-in

spindle

servo

LPF.

Built-in

loop

filter

and

VCO

for

an

EFM

clock

generating

PLL.

A

minimum

of

external

parts

required.

Sled

overrun

prevention

circuit.

Disc

defect

treatment

circuit.

Anti-shock

circuit

Linear

motor

feed

for

high-speed

access.

Block

diagram

12L

DATA

REGISTER

Shared

use

of

a

serial

data

bus

with

the

CX23035

and

CXD11350.

The

microprocessor

and

software

both

have

upward

com-

patibility

with

the

CX20108.

The

pulse

height

of

the

focusing

search,

track

jump,

and

sled kick

can

be

set

with

externally

connected

resistors.

Functions

Focusing

servo

control

Tracking

servo

control

Sled

servo

control

Spindle

servo

Low

Pass

Filter,

drive

amplifier

EFM

clock

generating

PLL

Loop

filter:

8.64

MHz

VCO

Auto

sequencer

Incorporating

a

RAM

Structure

Bipolar

silicon

monolithic

IC

INPUT

SHIFT

REGISTER

ADDRESS

-

DECODER

SEQUENCER

OUTPUT

DECODER

TMI~?7

PS1~3

Kenwood DPC-77 User manual

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